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<p>Reports GDScript classes that are never instantiated, extended, or referenced from Godot scenes/resources, and suggests removing them.</p>
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<p>Notes:</p>
<ul>
  <li>Global classes declared with <code>class_name</code> and inner classes are checked.</li>
  <li>References from .tscn/.tres files are taken into account.</li>
  <li>Inherited or overridden usages are not reported.</li>
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